JP5734797B2 - Suspension bracket - Google Patents

Description

  The present invention relates to a suspension bracket in which an upper part is fastened to a body frame with bolts and a lower part is connected to a suspension link located below the body frame.

  Link-type suspension devices are known as suspension devices for trucks and buses. The link type suspension device connects an axle housing and a vehicle body frame by several rods and arms (links), and determines the position of an axle shaft (axle) supported by the axle housing by these links. An example of a link type suspension device 1 will be described with reference to FIG. This suspension device 1 is a tandem shaft 4-back double-trailing rear-shaft air suspension device used for large trucks and the like. In FIG. 1, the left front axis is a drive axis and the right rear axis is a dead axis, but both axes may be drive axes.

  FIG. 1A is a side view of the suspension device 1, and FIG. 1B is a plan view of the suspension device 1. The suspension device 1 is provided between the axle housing 2 and the side member of the vehicle body frame 3, and attenuates the force applied to the wheels 4 from the road surface and transmits it to the vehicle body frame 3. A center portion of the axle beam 5 is attached to the lower portion of the axle housing 2 with an interval in the vehicle width direction, and a lower end portion of an air spring (air bellows) 6 is attached to each end portion of the axle beam 5. The upper end of the air spring 6 is attached to the vehicle body frame 3. According to this configuration, the force applied from the road surface to the wheel 4 attached to the axle shaft 7 supported by the axle housing 2 is attenuated by the air spring 6 and transmitted to the vehicle body frame 3.

  An axle bracket 8 is attached to the center upper portion of the axle housing 2, and one end of a V rod (link) 9 formed in a V shape is connected to the axle bracket 8 by a pin or the like. The other end of the V rod 9 is connected to the vehicle body frame 3 by a pin or the like. One end of a trailing arm (link) 10 is connected to an axle beam 5 attached to the axle housing 2 by a pin or the like. The other end of the trailing arm 10 is connected to a suspension bracket (trailing arm bracket) 11 fastened to the vehicle body frame 3 with a bolt or the like. According to this configuration, the ascending / descending locus of the wheel 4 that moves up and down in response to the reaction force from the road surface is determined by the V rod 9 and the trailing arm 10.

  By the way, the suspension bracket 11 has an upper portion fastened to the vehicle body frame 3 and a trailing arm 10 connected to the lower portion, so that a start drive input at the time of vehicle start, a brake input at the time of braking, and the like via the trailing arm 10. Receives the vehicle longitudinal force from the road surface. This force increases according to the vehicle weight (axial weight). Further, when the trailing arm 10 is made of a plate material, and is a stabilizer linker that obtains the anti-roll characteristic of the vehicle by a reaction force when the plate material is twisted, the suspension bracket 11 also receives a torsional force by the stabilizer linker. Therefore, the suspension bracket 11 is required to have rigidity in consideration of these forces.

  In addition, as shown in FIG. 1, when the axle shaft 7 is a tandem shaft arranged in two front and rear axes, air springs 6 are arranged on the front and rear left and right of each axle, and four air springs 6 are arranged per axis (4 The suspension bracket 11 must be disposed between the air spring 6 on the rear side of the front shaft and the air spring 6 on the front side of the rear shaft, and the shape and layout of the suspension bracket 11 are severely restricted. Occurs.

  As described above, the suspension bracket 11 is required to have rigidity corresponding to the axial load and is restricted by the shape and layout. Therefore, in a large truck with a high axial load, the sheet metal assembly structure is advantageous for mass production and cost reduction. However, strength cannot be satisfied, and castings (castings) are mainstream (see Patent Documents 1 and 2).

Japanese Patent No. 3919602 JP 2002-307920 A

  On the other hand, there are some medium- and small-sized trucks and the like in which the axial weight is not so high, in which the suspension bracket 11 has a sheet metal assembly structure. A conventional suspension bracket having a sheet metal assembly structure will be described with reference to FIGS. 2A is a partial perspective view of a suspension bracket 11a having a sheet metal assembly structure according to a first conventional example, FIG. 2B is a cross-sectional view taken along the line IIb-IIb in FIG. 2A, and FIG. 2 is a partial perspective view of a suspension bracket 11b of a sheet metal assembly structure showing a conventional example, and FIG. 3B is a sectional view taken along line IIIb-IIIb in FIG.

  The suspension bracket 11a shown in FIG. 2 includes a sheet metal inner member 12a in contact with the vehicle body frame 3 (see FIG. 1) and a sheet metal outer member 13a disposed on the outer side in the vehicle width direction of the inner member 12a. The inner member 12a and the outer member 13a are formed by pressing a plate material (made of sheet metal). The outer member 13a includes a plate-like outer wall 14a, a vertical wall 15a extending inward in the vehicle width direction from both ends in the vehicle length direction of the outer wall 14a, and a vehicle length direction from the tip of the vertical wall 15a. And flanges 16a extending in the front-rear direction. The inner member 12a has an inner wall 17a formed so as to cover between the vertical walls 15a of the outer member 13a. By welding the inner member 12a to the outer member 13a, a box structure portion 18a surrounded by the outer wall 14a, the vertical wall 15a, and the inner wall 17a is formed. Reference numeral 19a in FIG. 2 (b) denotes a welded portion (weld bead), and the welded portion 19a is omitted in FIG. 2 (a). A hole 20a through which a bolt is inserted is formed in the flange 16a of the outer member 13a and the inner wall 17a of the inner member 12a, and the bolt inserted through the hole 20a is fastened to the vehicle body frame 3.

  Similarly to the suspension bracket 11a shown in FIG. 2, the suspension bracket 11b shown in FIG. 3 has a sheet metal inner member 12b and an outer member 13b welded thereto. The outer member 13b has an outer wall 14b, a vertical wall 15b, and a flange 16b. The inner member 12b has an inner wall 17b. By welding the inner member 12b to the outer member 13b, the outer wall 14b, the vertical wall 15b, and the inner wall 17b. And a box structure 18b surrounded by. In FIG. 3 (b), 19b is a welded portion, and the welded portion 19b is omitted in FIG. 3 (a). A hole 20b through which a bolt is inserted is formed in the flange 16b of the outer member 13b and the inner wall 17b of the inner member 12b, and the bolt inserted through the hole 20b is fastened to the vehicle body frame 3. Here, the interval between the vertical walls 15b of the outer member 13b (the width Wb of the box structure portion 18b in the vehicle length direction) is set wider than that of FIG. 2 (the width Wa of the box structure portion 18a in the vehicle length direction). A hole 21b is formed in the outer wall 14b, and a cylindrical collar 22b is attached to the hole 21b and welded. The bolt inserted through the collar 22b is inserted into the hole 23b formed in the inner wall 17b and fastened to the vehicle body frame 3.

  In the suspension bracket 11b shown in FIG. 3, the width Wb in the vehicle length direction of the box structure portion 18b is wider than the width Wa in the vehicle length direction of the box structure portion 18a of the type in FIG. The rigidity with respect to the input in the vehicle longitudinal direction applied via the ring arm 10 is higher than that of the type shown in FIG. However, since the bolt fastening point pitch Pb is narrower than the fastening point pitch Pa of the type of FIG. 2, the bolt fastening burden on the vehicle body frame 3 is larger than the type of FIG. That is, since the fastening point pitch Pb is narrow, a high stress is generated in the vehicle body frame 3 near the bolt fastening point, and the strength of the vehicle body frame 3 may be insufficient.

  On the other hand, in the suspension bracket 11a shown in FIG. 2, since the bolt fastening point pitch Pa can be secured wider than the fastening point pitch Pb of the type of FIG. 3, the burden of bolt fastening to the vehicle body frame 3 is more than that of the type of FIG. Get smaller. However, since the width Wa in the vehicle length direction of the box structure portion 18a is narrower than the width Wb in the vehicle length direction of the box structure portion 18b of the type shown in FIG. 3, the vehicle front and rear applied from the axle case 2 via the trailing arm 10 The rigidity with respect to the input of the direction is lower than that of the type shown in FIG. Further, since the bolt fastened to the vehicle body frame 3 is inserted into the hole 20a formed through the portion where the flange 16a of the outer member 13a and the inner wall 17a of the inner member 12a are overlapped, and fastened to the vehicle body frame 3, There is a drawback in that the bolt's neck length is shortened and the bolt's shear strength is low.

  As described above, the suspension bracket 11a of FIG. 2 and the suspension bracket 11b of FIG. 3 have advantages and disadvantages, respectively, and when the bolt fastening point pitch Pa is widened as in the type of FIG. If the width Wa in the longitudinal direction becomes narrow and the rigidity with respect to the input in the longitudinal direction of the vehicle becomes low, and the width Wb in the vehicle length direction of the box structure portion 18b is increased as in the type of FIG. 3, the bolt fastening point pitch Pb There is a problem that the load of fastening bolts to the vehicle body frame 3 becomes large due to the narrowing of the body frame.

  The purpose of the present invention, which was created in consideration of the above circumstances, is to widen the bolt fastening point pitch to reduce the burden of bolt fastening to the body frame and to widen the width of the box structure in the vehicle length direction. An object of the present invention is to provide a suspension bracket that can achieve both high rigidity for input in the vehicle front-rear direction and can be produced at a low cost.

  The suspension bracket according to the present invention, which was created to achieve the above-described object, is a suspension bracket that is fastened with a bolt to a vehicle body frame and to which a suspension link located below the vehicle body frame is connected. And an outer member disposed on the outer side of the inner member in the vehicle width direction, the outer member being spaced from the outer wall in the vehicle length direction by an interval in the vehicle length direction. The inner member has an inner wall formed so as to cover between the vertical walls of the outer member, and the inner member is welded to the outer member. A box structure part surrounded by the outer wall and the vertical wall of the outer member and the inner wall of the inner member is formed, and the vehicle body frame is formed on the vertical wall of the outer member forming the box structure part. Wherein the bolt is fastened to the arm is disposed a color to be inserted.

  In the suspension bracket according to the present invention, a cutout portion that is cut out in accordance with the shape of the collar may be formed on the vertical wall of the outer member and in the vicinity thereof, and the collar may be attached and welded to the cutout portion.

  In the suspension bracket according to the present invention, the collar may be attached to the cutout portion and welded so that the center of the collar is located within the plate thickness of the vertical wall.

  In the suspension bracket according to the present invention, the welded portion to the cutout portion of the collar may be formed in an annular shape along the contact portion between the collar and the cutout portion.

  In the suspension bracket according to the present invention, the outer member may have a flange extending from the vertical wall in the vehicle length direction, and the flange may be welded to the inner member.

  In the suspension bracket according to the present invention, the outer member and the inner member may be formed by pressing a plate material.

  According to the suspension bracket according to the present invention, by welding the inner member to the outer member, a box structure portion is formed by the outer wall and the vertical wall of the outer member and the inner wall of the inner member, and on the vertical wall of the box structure portion, A collar is provided through which a bolt for fastening to the body frame is inserted.

  This collar reinforces the box structure and improves rigidity. Further, by increasing the distance between the vertical walls where the collars are arranged, that is, the width of the box structure portion in the vehicle length direction, the fastening point pitch of the bolts inserted through the collars to the body frame is also increased. Accordingly, it is possible to achieve both the improvement of the rigidity with respect to the input in the longitudinal direction of the vehicle by widening the width of the box structure portion in the vehicle length direction and the reduction of the burden of bolt fastening to the vehicle body frame by widening the bolt fastening point pitch.

  An outer member having an outer wall and a vertical wall and an inner member having an inner wall can be formed by pressing a plate material, respectively. Therefore, the suspension bracket according to the present invention is a suspension bracket having a sheet metal assembly structure, and is lighter and can be produced at a lower cost than a conventional suspension bracket.

It is explanatory drawing of the suspension apparatus applied to a large sized truck etc., (a) is a side view of a suspension apparatus, (b) is a top view of a suspension apparatus. It is explanatory drawing of the suspension bracket which shows a 1st prior art example, (a) is a fragmentary perspective view of a suspension bracket, (b) is the IIb-IIb sectional view taken on the line of (a). It is explanatory drawing of the suspension bracket which shows a 2nd prior art example, (a) is a fragmentary perspective view of a suspension bracket, (b) is the IIIb-IIIb sectional view taken on the line of (a). It is explanatory drawing of the suspension bracket which concerns on 1st Embodiment of this invention, (a) is a fragmentary perspective view of a suspension bracket, (b) is the IVb-IVb sectional view taken on the line of (a). FIG. 5 is a partially enlarged perspective view of FIG. 4. (A) is the VIa-VIa sectional view taken on the line of FIG. 5, (b) is the VIb-VIb sectional view taken on the line of (a). (A) is a partial sectional view of a suspension bracket according to a second embodiment of the present invention, (b) is a partial sectional view of a suspension bracket according to a third embodiment of the present invention, and (c) is a fourth embodiment of the present invention. It is a fragmentary sectional view of the suspension bracket which concerns on a form. It is a partial expansion perspective view of a suspension bracket concerning a 5th embodiment of the present invention. It is a fragmentary perspective view of the suspension bracket which concerns on 6th Embodiment of this invention. (A) is the Xa-Xa sectional view taken on the line of FIG. 9, (b) is the Xb-Xb sectional view taken on the line of FIG. 9, (c) is the Xc-Xc sectional view taken on the line of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
The suspension bracket 11 according to the first embodiment of the present invention will be described with reference to FIG. 4A is a partial perspective view of the suspension bracket 11, and FIG. 4B is a cross-sectional view taken along the line IVb-IVb in FIG. 4A.

  The suspension bracket 11 according to the present embodiment has a suspension link (trailing arm, stabilizer, etc.) 10 that is fastened to the side member of the vehicle body frame 3 shown in FIG. Are to be connected. The suspension bracket 11 includes a sheet metal inner member 12 disposed on the vehicle body frame 3 side and a sheet metal outer member 13 disposed on the outer side in the vehicle width direction of the inner member 12.

  The outer member 13 includes a plate-like outer wall 14, and vertical walls 15 that extend at right angles (not necessarily right angles) from both ends of the outer wall 14 in the vehicle length direction to the inside in the vehicle width direction, And a flange 16 extending at right angles (not necessarily right angle) from the front end of the vertical wall 15 to the front and rear in the vehicle length direction, and formed into a cross-sectional hat shape by pressing a plate material Yes. The inner member 12 has an inner wall 17 formed so as to cover between the vertical walls 15 of the outer member 13, and is molded by pressing a plate material. The inner member 12 is welded to the outer member 13 with the flange 16 of the outer member 13 overlapped with the inner wall 17 of the inner member 12, and is surrounded by the outer wall 14 and the vertical wall 15 of the outer member 13 and the inner wall 17 of the inner member 12. A broken box structure 18 is formed. In FIG. 4B, reference numeral 19 denotes a welded portion, and the welded portion 19 is omitted in FIG.

  A hole 20 through which a bolt fastened to the vehicle body frame 3 is inserted is formed in a portion where the flange 16 of the outer member 13 and the inner wall 17 of the inner member 12 overlap each other. A cylindrical collar 22 into which a bolt fastened to the vehicle body frame 3 is inserted is disposed on the vertical wall 15 of the outer member 13 forming the box structure portion 18 so as to overlap the vertical wall 15 and welded. In the inner wall 17 of the inner member 12, a hole 23 through which a bolt inserted through the collar 22 is inserted is formed in accordance with the position of the collar 22.

  As shown in FIG. 5 which is a partially enlarged view of FIG. 4A, the vertical wall 15 of the outer member 13 and the outer wall 14 and the flange 16 in the vicinity thereof are formed with a notch 24 according to the shape of the collar 22. The collar 22 is attached and welded to the notch 24. The notch 24 is cut into the outer wall 14 in a semicircular shape according to the outer diameter of the collar 22, and the vertical wall 15 is cut in parallel with the same width from both ends of the upper notch 25. It has a middle notch portion 26 and a lower notch portion 27 that is cut in a semicircular shape along both ends of the middle notch portion 26 in the flange 16, and has the same outer diameter as that of the collar 22 when viewed from the vertical direction of the outer wall 14. It is formed in the shape of a hole with a diameter. Note that the middle notch 26 is not parallel when the outer wall 14 and the vertical wall 15 are not perpendicular. The collar 22 is attached to the cutout portion 24 in a state where the collar 22 is half buried in the vertical wall 15. The collar 22 attached to the notch 24 is continuously welded in an annular shape along the contact portion between the collar 22 and the notch 24 without interruption. That is, the welded portion 28 to the cutout portion 24 of the collar 22 is formed in an annular shape along the contact portion between the collar 22 and the cutout portion 24, and there is no welding start end, and stress concentration hardly occurs.

  As shown in FIG. 6A which is a sectional view taken along line VIa-VIa in FIG. 5 and FIG. 6B which is a sectional view taken along line VIb-VIb in FIG. 6A, the collar 22 overlaps the vertical wall 15. Thus, it is arranged perpendicular to the outer wall 14 and the flange 16. The collar 22 is welded to the cutout portion 24 by a welding portion 28 and is integrated with the vertical wall 15, the outer wall 14, and the flange 16, and functions as a reinforcing material for the box structure portion 18. The collar 22 is preferably attached to the notch 24 and welded so that the center of the collar 22 is located within the plate thickness of the vertical wall 15. This is because the center of the collar 22 is positioned within the plate thickness of the vertical wall 15 so that the vertical wall 15 can be reinforced accurately by the collar 22. In the present embodiment, the center of the collar 22 coincides with the center of the plate thickness of the vertical wall 15. However, even if the center of the collar 22 deviates from the thickness of the vertical wall 15, the collar 22 can be used to reinforce the vertical wall 15 as long as the collar 22 can be appropriately welded to the vertical wall 15 and integrated with the vertical wall 15. Functions as a material. Therefore, if the collar 22 is partially overlapped with the vertical wall 15 and the collar 22 is appropriately welded to the vertical wall 15, the center of the collar 22 may be out of the plate thickness of the vertical wall 15.

(Action / Effect)
As shown in FIG. 4, according to the suspension bracket 11 according to the present embodiment, the outer wall 14 and the vertical wall 15 of the outer member 13 and the inner wall 17 of the inner member 12 are welded to the outer member 13. A box structure 18 is formed, and a collar 22 through which a bolt to be fastened to the vehicle body frame 3 is inserted is disposed so as to overlap the vertical wall 15 of the box structure 18. The collar 22 reinforces the box structure 18 and improves rigidity.

  A vehicle start driving input, a braking input, and the like are input to the suspension bracket 11 via a link (trailing arm, stabilizer, etc.) 10 of the suspension device 1 shown in FIG. When an external force is applied to the box structure portion 18 in this way, the rectangular cross section in plan view of the box structure portion 18 tends to be deformed into a parallelogram shape, and the vertical walls 15 constituting a pair of front and rear short sides of the rectangular cross section are notched portions. Since it is reinforced by the collar 22 welded to 24, deformation is suppressed and rigidity is improved.

  As shown in FIG. 5, the welded portion 28 to the notch 24 of the collar 22 that reinforces the vertical wall 15 is continuously formed in an annular shape along the contact portion between the collar 22 and the notch 24. There is no welding end. Therefore, stress concentration is unlikely to occur in the welded portion 28 in the vicinity of the collar 22 where the force input to the suspension bracket 11 from the link (trailing arm, stabilizer, etc.) 10 is finally transmitted to the vehicle body frame 3. Therefore, high durability and reliability can be ensured.

  Further, the bolts inserted into the collar 22 are fastened to the vehicle body frame 3 by increasing the distance between the vertical walls 15 provided with the collar 22 shown in FIG. 4, that is, the width W in the vehicle length direction of the box structure 18. This also increases the point pitch P. Accordingly, the rigidity of the input to the vehicle in the longitudinal direction is increased by increasing the width W of the box structure portion 18 in the vehicle length direction, and the burden of bolt fastening to the vehicle body frame 3 is reduced by increasing the bolt fastening point pitch P. Can be compatible.

  That is, according to the present embodiment shown in FIG. 4, the distance between the vertical walls 15, that is, the width W in the vehicle length direction of the box structure portion 18 can be increased compared to the first conventional example shown in FIG. As compared with the second conventional example shown in FIG. 3, the fastening point pitch P of the bolt to the vehicle body frame 3 can be widened, so that the burden of bolt fastening to the vehicle body frame 3 is reduced. .

  The outer member 14, the outer wall 13 having the vertical wall 15 and the flange 16, and the inner member 12 having the inner wall 17 are each formed by pressing a plate material. Therefore, the suspension bracket 11 according to the present embodiment assembled by welding the sheet metal outer member 13 and the inner member 12 has a sheet metal assembly structure, and is lighter and lower in cost than a conventional suspension suspension bracket. Can be manufactured.

  The bolt inserted through the collar 22 is fastened to the vehicle body frame 3 at the front end thereof, and the neck length of the bolt is a length corresponding to the length of the collar 22. If the length below the neck of the bolt is increased, the shear strength of the bolt is improved. In the present embodiment shown in FIG. 4, the bolt inserted into the collar 22 has a length below the neck of the bolt corresponding to the length of the collar 22 as compared with the bolt inserted into the hole 20a of the first conventional example shown in FIG. Becomes longer, and the shear strength of the bolt increases.

(Second Embodiment)
A suspension bracket 11x according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7A is a partial cross-sectional view of the suspension bracket 11x according to the second embodiment. The suspension bracket 11x has the same basic components as the suspension bracket 11 of the first embodiment described above, and the flange 16 (see FIG. 6A) of the outer member 13 of the first embodiment. Differences are omitted. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The outer member 13x of the second embodiment is composed of an outer wall 14x and a vertical wall 15x extending from both ends in the vehicle length direction of the outer wall 14x at a right angle (not necessarily right angle) inward in the vehicle width direction. It is formed in a U-shaped cross section. The front end of the vertical wall 15 x is abutted at right angles (not necessarily at right angles) to the inner wall 17 of the inner member 12 and is welded to the inner wall 17. Further, the notch 24x to which the collar 22 is mounted is composed of an upper notch 25x formed in the outer wall 14x of the outer member 13x and a middle notch 26x formed in the vertical wall 15x. In FIG. The lower cutout portion 27 formed in is omitted. Reference numeral 28x denotes a welded portion of the collar 22 to the notch 24x. The basic operational effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
A suspension bracket 11y according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7B is a partial cross-sectional view of the suspension bracket 11y according to the third embodiment. The suspension bracket 11y has the same basic components as the suspension bracket 11x of the second embodiment described above, and a hole 23y corresponding to the outer diameter of the collar 22y is formed in the inner wall 17y of the inner member 12y. The difference is that the collar 22y is attached to the hole 23y. Thereby, the attachment strength of the collar 22y can be increased as compared with the second embodiment. The same components as those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted. The basic operational effects of the third embodiment are the same as those of the second embodiment.

(Fourth embodiment)
A suspension bracket 11z according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7C is a partial cross-sectional view of the suspension bracket 11z according to the fourth embodiment. The suspension bracket 11z has the same basic components as the suspension bracket 11y of the third embodiment described above, and the collar 22z is penetrated through the hole 23y formed in the inner wall 17y of the inner member 12y. The lower surface of 17y is also welded annularly along the periphery of hole 23y (28z is a welded portion). Thereby, the collar 22z is firmly welded, and the mounting strength of the collar 22z can be further increased than in the third embodiment. The same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted. The basic effects of the fourth embodiment are the same as those of the third embodiment.

(Fifth embodiment)
A suspension bracket 11v according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a partial perspective view of the suspension bracket 11v according to the fifth embodiment. The suspension bracket 11v has the same basic components as the suspension bracket 11 of the first embodiment shown in FIG. 5 described above, and has a notch formed for mounting the collar 22 on the outer member 13v. The shape of 24v is different. Therefore, the same components as those in the fourth embodiment are denoted by the same reference numerals and description thereof is omitted.

  The cutout portion 24v of the fifth embodiment includes an upper cutout portion 25v cut in a semicircular shape in accordance with the outer diameter of the collar 22 on the outer wall 14v of the outer member 13v, and a vertical wall 15v from both ends of the upper cutout portion 25v. It has a middle notch 26v cut out in parallel with the same width, and a lower notch 27v cut out in parallel with the same width in the flange 16v along both ends of the middle notch 26v, and the vertical direction of the outer wall 14v As seen from above, the shape is cut out in a U-shape. Note that the middle notch 26v is not parallel when the outer wall 14v and the vertical wall 15v are not perpendicular, and the lower notch 27v may not be parallel. The collar 22 is attached to the cutout portion 24v in a state where the collar 22 is half buried in the vertical wall 15v. The collar 22 attached to the cutout portion 24v is not interrupted along the contact portion between the collar 22 and the cutout portion 24v. Continuously welded in an annular shape. Reference numeral 28 denotes a welded portion. The basic operational effects of the fifth embodiment are the same as those of the first embodiment.

(Sixth embodiment)
A suspension bracket 11w according to a sixth embodiment of the present invention will be described with reference to FIGS. 9 is a partial perspective view of the suspension bracket 11w according to the sixth embodiment, FIG. 10A is a cross-sectional view taken along line Xa-Xa in FIG. 9, and FIG. 10B is a cross-sectional view taken along line Xb-Xb in FIG. 10 (c) is a sectional view taken along line Xc-Xc in FIG. The suspension bracket 11w has the same basic components as the suspension bracket 11 of the first embodiment described above, and the shapes of the outer member 13w and the inner member 12w are different. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The inner member 12w has a protruding inner wall 17w protruding upward from the outer member 13w, and a hole 29w through which a bolt fastened to the vehicle body frame 3 is inserted is formed in the protruding inner wall 17w. The outer member 13w has an upper portion (cross-section hat-shaped portion) 13wu composed of an outer wall 14w, a vertical wall 15w, and a flange 16w, and a lower portion (cross-section U-shaped portion) 13wd composed of the outer wall 14w and the vertical wall 15w. . The box structure 18w is formed by welding the outer member 13w to the inner member 12w. In FIG. 10, 19w is a welded portion, and this welded portion 19w is omitted in FIG.

  As shown in FIGS. 9 and 10A, a hole 20 w through which a bolt fastened to the vehicle body frame 3 is inserted is formed in the flange 16 w of the cross-sectional hat-shaped portion 13 wu and the protruding inner wall 17 w on which the flange 16 w overlaps. . A hole 21wu through which the collar 22wu is inserted and welded is formed in the outer wall 14w of the cross-sectional hat-shaped portion 13wu. In FIG. 10A, 28wu is a welded portion, and this welded portion 28wu is omitted in FIG. Bolts to be fastened to the vehicle body frame 3 are inserted into the collar 22wu welded to the holes 21wu. The inner member 12w on which the cross-sectional hat-shaped portion 13wu is overlapped is formed with a hole 23wu through which a bolt inserted through the collar 22wu is inserted.

  As shown in FIGS. 9 and 10 (b), a collar 22wd through which a bolt fastened to the vehicle body frame 3 passes is overlapped with the vertical wall 15w on the vertical wall 15w of the U-shaped section 13wd. It is arranged. A hole 23wd through which a bolt inserted through the collar 22wd is inserted is formed in the inner member 12w on which the U-shaped section 13wd is overlapped. A cutout 24w is formed in the vertical wall 15w and the outer wall 14w of the U-shaped section 13wd according to the shape of the collar, and the collar 22wd is mounted and welded to the cutout 24w.

  The cutout portion 24w is cut into the outer wall 14w in the same width from both ends of the upper cutout portion 25w in parallel with the upper cutout portion 25w cut out in a semicircular shape according to the outer diameter of the collar 22wd. A middle notch 26w. The middle notch 26w is not parallel when the outer wall 14w and the vertical wall 15w are not perpendicular. The collar 22wd is attached to the notch 24w in a state where the collar 22wd is approximately half buried in the vertical wall 15w. The collar 22wd attached to the notch 24w is continuously annular along the contact portion between the collar 22wd and the notch 24w. It is welded to. In FIG. 10B, 28wd is a welded portion, and this welded portion 28wd is omitted in FIG.

  According to the suspension bracket 11w according to the sixth embodiment, when a force is applied from the link (trailing arm, stabilizer, etc.) 10 of the suspension device 1 shown in FIG. A portion that is easy and requires space saving due to restrictions on the layout with other components (air spring 6) can be accurately reinforced by the collar 22wd disposed on the vertical wall 15w. And the part which does not produce such a high stress is aiming at weight reduction as a simple structure. Therefore, improvement in strength and rigidity and weight reduction can be achieved at a high level. The basic operational effects of the sixth embodiment are the same as those of the first embodiment.

(Other)
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention.

  For example, the present invention is not only applied to a rear axle air suspension for a large truck of a tandem shaft 4 back type double trailing as shown in FIG. 1, but also a single shaft, 2 back type, leading, leading trailing, etc. Applicable to all types of link type suspensions. The axle may be a drive shaft or a dead shaft. In FIG. 1, the left front axle axle is a drive axis, and the right rear axle axle is a dead axle.

  Also, so-called link type suspensions can be applied to suspension brackets of vehicles other than large trucks such as large buses, semi-trailers, full trailers, etc., and can be applied not only to rear wheel side suspensions but also to front wheel side suspensions. . Further, the present invention can be applied to a link type suspension using a coil spring or a leaf spring instead of an air spring.

  The present invention may be applied to suspensions of small to medium trucks having a low axle load, not large trucks having a high axle weight. In this case, the conventionally used suspension bracket of the sheet metal assembly structure shown in FIGS. 2 and 3 is the suspension bracket of the embodiment shown in FIG. 4 and the subsequent drawings, so that it has higher rigidity, higher strength and more robustness than the conventional product. It can be a simple structure. Therefore, the thickness of the suspension bracket can be reduced, the size and number of bolts can be reduced, and weight reduction and cost reduction can be promoted.

  The present invention can be used for a suspension bracket that is fastened to a vehicle body frame with a bolt and connected to a suspension link positioned below the vehicle body frame.

1 Suspension device 3 Body frame 10 Link (trailing arm, stabilizer linker)
DESCRIPTION OF SYMBOLS 11 Suspension bracket 12 Inner member 13 Outer member 14 Outer wall 15 Vertical wall 16 Flange 17 Inner wall 18 Box structure part 22 Collar 24 Notch part 28 Welding part W Width of box structure part in the vehicle length P Fastening of bolt fastened to body frame pitch

Claims (6)

A suspension bracket that is fastened to the body frame with bolts and to which a suspension link located below the body frame is connected,
An inner member disposed on the vehicle body frame side and an outer member disposed on the outer side in the vehicle width direction of the inner member;
The outer member has a plate-like outer wall, and vertical walls extending from the outer wall inward in the vehicle width direction with a distance in the vehicle length direction,
The inner member has an inner wall formed so as to cover between the vertical walls of the outer member;
By welding the inner member to the outer member, a box structure part surrounded by the outer wall and the vertical wall of the outer member and the inner wall of the inner member is formed,
A suspension bracket, wherein a collar through which a bolt fastened to the vehicle body frame is inserted is disposed on a vertical wall of the outer member forming the box structure portion.   2. The suspension bracket according to claim 1, wherein a cutout portion that is cut out in accordance with the shape of the collar is formed in a vertical wall of the outer member and the vicinity thereof, and the collar is mounted and welded to the cutout portion. .   The suspension bracket according to claim 2, wherein the collar is mounted and welded to the notch so that a center of the collar is located within a plate thickness of the vertical wall.   The suspension bracket according to claim 2 or 3, wherein a welded portion of the collar to the notch is formed in an annular shape along a contact portion between the collar and the notch.   The suspension bracket according to any one of claims 1 to 4, wherein the outer member has a flange extending in the vehicle length direction from the vertical wall, and the flange is welded to the inner member.   The suspension bracket according to any one of claims 1 to 5, wherein the outer member and the inner member are formed by pressing a plate material.

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